China’s leaders fired a top regulator and set out specifics on how they intend to restructure the economy

BEIJING—China’s leaders moved to dispel perceptions of disarray in the management of the world’s second-largest economy, firing a top regulator and setting out specifics on how they intend to restructure the economy without having growth fall off a cliff.

The departure of Xiao Gang as head of the China Securities Regulatory Commission, first reported by The Wall Street Journal on Friday, was announced by the official Xinhua News...